EMC XtremIO specific resource capacities

10/15/2018 9:02 PM

10/15/2018 9:02 PM

This articles provides a description of resource capacities for SRM users who are monitoring the EMC XtremIO storage array.

Storage Resource Monitor

RAW DISK CAPACITY SUMMARY & ARRAY RAW DISK CAPACITY SUMMARY
Entity	Label	General Description	EMC XtremIO Specific Description
Storage Array	Raw Capacity	The total physical disk capacity of the storage array.	The sum of physical size of all SSDs in the XtremIO storage array.
Storage Array	Total Used Capacity (Used)	The assigned physical capacity of the storage array for RAID Groups or storage pools. It includes overhead for creating RAID Groups or storage pools.	The sum of physical size of all SSDs in the XtremIO storage array.
Storage Array	Total Free Capacity (Remaining)	The unassigned physical capacity of the storage array.	For XtremIO storage array it is always zero. This is because the there are no unassigned physical disks on this storage array.
Storage Array	Spare	The total physical capacity of all spare disks in the storage array.	For XtremIO storage array it is always zero. There are no dedicated spare disks on the XtremIO storage array and spare capacity is not applicable for it.

 

USABLE CAPACITY SUMMARY & ARRAY USABLE CAPACITY SUMMARY
Entity	Label	General Description	EMC XtremIO Specific Description
Storage Array	Total Usable Capacity	The total usable capacity on the array.   It is calculated as the sum of usable capacity of all storage pools from which LUNs can be created. For arrays where pools are created off RAID groups, total usable capacity excludes the RAID overhead.  It may include the metadata space used by LUN snapshots and in some cases the metadata space required for storage array administration.	The total user data space on all the SSDs in the XtremIO storage array. This is the Usable “Physical Capacity” shown in the XtremIO management console.
Storage Array	Used	The amount of usable capacity allocated for LUNs or for metadata on the storage array.	The amount of user data SSD space in use in the XtremIO storage array.
Storage Array	Remaining	The amount of free usable space available for creating more LUNs or for metadata on this storage array.	The amount of user data SSD space which is free on the XtremIO storage array. It is calculated as (Total Usable Capacity - Used).

 

THIN STORAGE POOLS
Entity	Label	General Description	EMC XtremIO Specific Description
Storage Pool	Total Size	The total usable capacity of the storage pool. This capacity can be used for creating LUNs or for metadata.	XtremIO storage array has no pools defined in the array architecture. The 'Virtual Pool' represents the overall usable capacity of the array itself. It is the total user data space on all the SSDs in the XtremIO storage array. This is the Usable “Physical Capacity” shown in the XtremIO management console.
Storage Pool	Provisioned Capacity	The amount of usable capacity consumed by all LUNs allocated from this pool. It may include the capacity reserved (not yet in use) for the LUNs if the array supports reservation.	The amount of user data SSD space in use in the XtremIO storage array
Storage Pool	Subscribed Capacity	The total of host reported capacity of all LUNs subscribed from this pool.	The total of host reported capacity of all LUNs (excludes snapshots) on the XtremIO storage array after the data reduction. Data reduction is the savings in space due to de-duplication and compression of data.
Storage Pool	Over-Subscribed Capacity	The amount of subscribed capacity of LUNs which exceeds the total size of the pool. It is calculated as ( |Total Size – Subscribed Capacity|).	The amount of subscribed capacity of all LUNs (excludes snapshots) after data reduction which exceeds the total usable capacity of the XtremIO storage array. Data reduction is the savings in space due to de-duplication and compression of data.

 

THICK STORAGE POOLS (NOT APPLICABLE FOR XTREMIO STORAGE ARRAY)
Entity	Label	General Description	EMC XtremIO Specific Description
Storage Pool	Total Size	The total usable capacity of the storage pool. This capacity can be used for creating LUNs or for metadata.	Not Applicable for XtremIO storage array.
Storage Pool	Provisioned Capacity	The amount of usable capacity consumed by all LUNs allocated from this pool. It may include the capacity reserved (not yet in use) for the LUNs if the array supports reservation.	Not Applicable for XtremIO storage array.

 

USABLE CAPACITY SUMMARY - POOL BAR CHART
Entity	Label	General Description	EMC XtremIO Specific Description
Storage Pool	Total	The total usable capacity of the storage pool. This capacity can be used for creating LUNs or for metadata.	XtremIO storage array has no pools defined in the array architecture. The 'Virtual Pool' represents the overall usable capacity of the array itself. It is the total user data space on all the SSDs in the XtremIO storage array. This is the Usable “Physical Capacity” shown in the XtremIO management console.
Storage Pool	Used	The amount of usable capacity allocated for LUNs or for metadata from this pool.	For XtremIO storage array, it is the same as provisioned capacity. It is the amount of user data SSD space in use in the XtremIO storage array.
Storage Pool	Remaining	The amount free usable space available from this pool for creating more LUNs or can be used for the metadata.	The amount of user data SSD space which is free. It is calculated as (Total - Used)

 

THIN LUNS
Entity	Label	General Description	EMC XtremIO Specific Description
LUN	Total Size	The host reported size of the LUN.	The host reported size of the LUN.
	Provisioned Size	The amount of space currently reserved for this LUN on this storage array.	The total user data space written to the Volume Snapshot Group before deduplication and compression. This is the logical space, not the actual physical space.
	File System Used Capacity	The sum of used capacity of server volumes which are created on this LUN and are monitored in SRM.  The server volumes must be manually or automatically mapped to the LUN for this to be reported.	The sum of used capacity of server volumes which are created on this LUN and are monitored in SRM.  The server volumes must be manually or automatically mapped to the LUN for this to be reported.

 

LUN DETAILS
Entity	Label	General Description	EMC XtremIO Specific Description
LUN	Consumed Capacity	The amount of space currently reserved for this LUN on this storage array.	The same as the Provisioned Size. It is the total user data space written to the Volume Snapshot Group before deduplication and compression. This is the logical space, not the actual physical space.

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